""ET TROJAN Suspected Cobalt Strike Beacon Activity (DNS)""
SID: 2033817
Revision: 2
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_07_06, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2021_07_06
Reference:
Protocol: udp
Source Network: $HOME_NET
Source Port: any
Destination Network: any
Destination Port: 53
Flow:
Contents:
-
Value: "|01|" Depth: 1 Offset: 2
-
Value: "|00 01 00 00 00 00 00|"
-
Value: "|10|defenderupdateav|03|com|00|"
Within: 7
PCRE: "/[a-z0-9]{32}\x10defenderupdateav\x03com\x00/"
Special Options:
-
fast_pattern
-
nocase